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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96fea886c12e15fc62e29a0d9582a269329663de35421653d2f6e601c092c103' 
  AND token = 'HCU63tKt9W15E1neJboaoCYmY4rPFTfQu8bo/S3SxwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}